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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cfe74c092302a14ebb178287370a780147faf4968f82c8d29d62cde406060c6' 
  AND token = '71E1Bc06ZHlI91WHCpWJIf7jWiKDS8mM3tu7ZnFJYnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}